Cutter



Aug. 25, 1942. E. w. GOHR CUTTER Filed Nov. 18, 1940 2 Sheets-She et 2 Patented Aug. 25, 1942 UNITED STATES PATENT OFFICE CUTTER Erwin W. Gohr, Milwaukee, Wis.

Application November 18, 1940, Serial No. 366,131

3 Claims.

My invention relates to in cutters.

The object of my invention is to provide a cutter principally used for cutting sheet material and which will not only out such material continuously throughout considerable length thereof, but may also be used to cut material surfaced with substances which would be classed as abrasives.

Other objects of my invention include the proimprovements vision of means for advancing and retracting material alternatively through the throat of my cutter and means for mounting my material cutter on a staging or other support where workmen must be accommodated while working on vertical surfaces.

In the drawings:

Figure 1 is a side elevation of my cutter.

Figure 2 is a plan view of my cutter.

Figure 3 is a side elevation showing portions of the mechanism broken away to exhibit interior construction.

Figure 4 is a section on line 4-4 of Fig. 1.

Figure 5 is a section on line 5--5 of Fig. 3.

Figure 6 is a side elevation of my cutter instrument to make a new kerf in a different direction.

My new cutter meets the various problems referred to above as will be seen from the following descriptions of the parts thereof and the manner in which my cutter is used.

structurally, my cutter, as shown in Figs. 1 to 5 inclusive, includes a main frame If] shaped as a C jaw unit, an adjustable bed II for the lower jaw I2, a quick acting clamp l3 for the upper jaw M, a knife guide I5 for the knife l6 incorporated in the upper jaw l4 and a handle I! for simultaneously operating the quick acting clamp l3 and the knife l6.

Sheet material I8 of the type above described and including bagasse l9 and asphalt and gravel 20 for the surface thereof may be received by the bed II and the quick acting clamp I3 to be cut and to be passed to the right as shown in Figs. 1 to 3 of the drawings, and the material at either side of the kerf formed by the knife l6 will pass at either side of the frame ill, at the innermost portion of the C shape thereof as shown in Fig. 5 where it will be seen that the web 2| is offset laterally at 22 with a shelf '23 therebetween so that the material may be elevated on one side of the kerf and depressed on any slicing or sawing action necessarily brings cutting edges against the abrasive material and against the sticky asphalt which soon spoils the edge of the cutting instrument. Furthermore, sheet material of this type is usually made up in broad sheets, the cutting of which would be most economically and efiiciently handled in a continuous cutting operation, but because of the high resistance to the cutting instrument through the material it has generally been considered necessary to place the sheet against a stop while the cutting progresses. This has, of necessity, forced the cutting to be done in successive stages, jrequiring laborious resetting of the work against T the stop.

Another problem in the cutting of sheet material is that when notches are to be cut it is often extremely difiicult to cause the knife or other cutting instrument to retreat from a kerf so that the other side of the kerf and thus enable the material to be passed in one continuous operation through my cutter.

The bed II is slotted at 25 and 26 to receive bolts 2'! and permit of adjustment whereby to accommodate various thicknesses of material l8 and to place the knurled surface 28 of the bed in parallelism with a friction surface 29 which forms the operating face of the quick acting clamp l3. Quick acting clamp I3 includes a bifurcated arm 30 pivotally mounted at 3| and horn shaped portion 32 of the upper jaw M of the frame extends through the opening 33 in the bifurcated arm.

Double linkage comprising a toggle with U shaped strap 35 and duplicate links 36 at either side of the horn 32 carries the quick acting clamp l3, since the duplicate links 36 are pinned to the arm 30 at 31 and pinned to the U shaped strap 35 at 38 and the U shaped strap is mounted on oscillatable pin 39 which is carried in the horn 32 which is arcuately slotted at 40. The pin 39 is provided with a spring 4| and is shapedto be slightly withdrawn and snapped from one end of the slot to the other for reasons about tobe described.

Handle I! has a floating fulcrum 45 on the the material may be repositioned in the cutting end of a link 46 which is pivotally mounted on pin 38 forming part of the toggle mechanism above described. The load end of the handle I! is pivoted at 41 to the end of knife slide 48 and since the knife slide 48 is mounted in guide I the knife I6 carried by the knife slide 48 can only reciprocate along straight lines in the center of a slot 49 formed in the quick acting clamp I3.

As shown in Fig. 4 the bed is slotted at 34 and the margins of the slotted bed are ribbed at 340. When the quick acting clamp is brought down upon the material and presses it against the bed II, the material to be cut is most heavily compressed along the margins of the slot and, therefore, most heavily compressed at either side of the line to be followed by the knife in cutting the material.

The operation of the handle and its associated parts is, therefore, as follows: Commencing in a cycle with the parts in the position'shown in Fig. 1 the free end 59 of the handle is raised and since the shape of the handle and the relation of the pivot pins 38, 45 and 4'! is as indicated in Fig. 1 the first movement tends to raise the pin "45 and to pull forwardly upon pin 38, thus lifting Assuming that the together with the material I8 will be'moved into the'jaws of the frame Hi. When the handle has been sufficiently swung so that 'the' knife slide 48jhas reached the end'of-the'guide I5 as shown in Fig. 3, the handle willstop and may then'be swung in'the opposite'direction. The first movement in the downward direction of the handle will thrust 'thepin45 toward the right, and the toggle linkage -36 will press the quick acting c'lamp'downwardly uponthe material I 8'un'til the material 'hasbeen firmly clamped. Then further movement of the handlewill cause the knife I6 to be advanced in 'a'cutting operation, since the slide48 will be withdrawn from'the guide I 5arid will carry the knife forwardly ina slicing operation which will continue until the handle has freachedthe position shown in Fig. 1, thus c'ompleting the cycle which may be repeated as'often as isnecessary to complete the length of cutting desired in the material I8.

If the cut isonly to progress part way through 'a'sheet I8'and the knife has reached the end of such a cut the knife maybe withdrawn from the 'kerf by reversing the mechanism. This is accomplished by pulling the 'pin'39 to unlock the U shaped member 35 and swing it'to theposition shown in dotted lines in Fig. 1, thus revers- "ing the toggle and reversing the effect of the movement of the handle I! so far as'clampirig action is concerned, 'since the raising of the handle will thereafter cause the material to be 'clarnped while the knife retreats in the kerf and causes the material to be released from the clamping operation while the knife and the sticky material are moved out'ofmy cutter as the handle'd'escends.

At one side of the frame It I provide a dovetail boss 60 receivable in a dove-tail slide complementary thereto formed as part of a standard BI. Standard 6| in turn is receivable in a staging clamp 62, the upper member 63 of which and the lower member 64 are shown clearly in Fig. 6. The lower member 64 has a threaded guide 65 receivable in a tubular boss 86 on the clamp 62. A clamp bolt 61 threaded into the boss 65 pulls the clamping surfaces 63 and 64 together upon a staging board 68 or other staging member upon the usual staging board receiver 69 on ladder I0. When in position upon the standard BI my cutter is in position to receive large sheets of material in handy working relationship to any workman standing on the staging board 68.

From the above description it will be seen that the knife I6 as it is reciprocated upon slide 48 in guide I5 has portions of its blade constantly presented to the relatively easily severable substances lfl of which the material is made, whereas another portion of the knife blade is constantly presented to separate the asphalt and abrasive material which does not require special keenness of blade edge. I have found that after 'hoursjof constant use, the portion of the blade presented to the cellulose material has retained its keenness and that the other portion presented to the abrasive has assumed a degree of blunt- 'ness not at all detrimental to its portion of the work. I- have also'ffound that sheets of material eight feet-longer longer may be passed with a considerable degree'of accuracy of alignment through my cutter without serious distortion of the material at 2I-22at the base of the C frame as shown in Fig. 5.

I claim:

1. A cutter including a C frame with one jaw having a work'clampingb'ed,a pivotally mounted work clamping'member "on said frame, and a toggle link to support the clamping member adjustably with reference to the clamping bed,-and a knife blade and knifebladebpe'rating arm corin'ec't'ed"to thelinter'ini'riber of said toggle link whereby the 'operation of the handle will alter the adjustment of saidclamp member.

2. A cutter including ';a-"C frame with one jaw having awork'claniping bed, a 'pivotally mounted work clamping member on-said frame, and a to; the clamping member adjustably with reference to the clamping bed, and a knife blade and knife blade operating arm con- 'nected to the member of said toggle link whereby the operation'of the handle will alter articulation and extending between the frame and said clamp arm whereby'the movement of the handle will clamp or release the clamp arm.

ERWIN W. GOHR. 

